Public bug reported:
systemd-sysusers.service/systemd.exec fails to start in privileged containers,
due to being unable to properly mount /dev for passing credentials, caused by
the following config in the .service unit:
```
# Optionally, pick up a root password and shell for the root user from a
# credential passed to the service manager. This is useful for importing this
# data from nspawn's --set-credential= switch.
LoadCredential=passwd.hashed-password.root
LoadCredential=passwd.plaintext-password.root
LoadCredential=passwd.shell.root
```
Reproducer:
$ lxc profile set default security.privileged "true"
$ lxc launch ubuntu-daily:jammy test
$ lxc exec test bash
# add-apt-repository ppa:ci-train-ppa-service/4704
# apt install systemd # install systemd 249.5-2ubuntu1
# systemctl restart systemd-sysusers
# systemctl status systemd-sysusers
# system --status=failed
$ lxc profile set default security.privileged "false"
A workaround is to disable it via:
$ cat /etc/systemd/system/systemd-sysusers.service.d/override.conf:
[Service]
LoadCredential=
Interesting logs:
Nov 12 12:09:44 test systemd[1]: systemd-journald.service: Added fd 42 (n/a) to
fd store.
Nov 12 12:09:44 test systemd[431]: Mounting /dev (MS_REC|MS_SLAVE "")...
Nov 12 12:09:44 test systemd[431]: Failed to mount n/a (type n/a) on /dev
(MS_REC|MS_SLAVE ""): Permission denied
Nov 12 12:09:44 test systemd[430]: (sd-mkdcreds) failed with exit status 1.
Nov 12 12:09:44 test systemd[430]: systemd-sysusers.service: Failed to set up
credentials: Protocol error
Nov 12 12:09:44 test systemd[430]: systemd-sysusers.service: Failed at step
CREDENTIALS spawning
** Affects: lxd (Ubuntu)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
systemd-sysusers.service/systemd.exec fails to start in privileged
containers, due to being unable to properly mount /dev for passing credentials,
caused by the following config in the .service unit:
# Optionally, pick up a root password and shell for the root user from a
# credential passed to the service manager. This is useful for importing this
# data from nspawn's --set-credential= switch.
LoadCredential=passwd.hashed-password.root
LoadCredential=passwd.plaintext-password.root
LoadCredential=passwd.shell.root
Reproducer:
$ lxc profile set default security.privileged "true"
$ lxc launch ubuntu-daily:jammy test
$ lxc exec test bash
# add-apt-repository ppa:ci-train-ppa-service/4704
# apt install systemd # install systemd 249.5-2ubuntu1
# systemctl restart systemd-sysusers
# systemctl status systemd-sysusers
# system --status=failed
$ lxc profile set default security.privileged "false"
A workaround is to disable it via:
$ cat /etc/systemd/system/systemd-sysusers.service.d/override.conf:
[Service]
LoadCredential=
Interesting logs:
Nov 12 12:09:44 test systemd[1]: systemd-journald.service: Added fd 42 (n/a)
to fd store.
Nov 12 12:09:44 test systemd[431]: Mounting /dev (MS_REC|MS_SLAVE "")...
Nov 12 12:09:44 test systemd[431]: Failed to mount n/a (type n/a) on /dev
(MS_REC|MS_SLAVE ""): Permission denied
Nov 12 12:09:44 test systemd[430]: (sd-mkdcreds) failed with exit status 1.
Nov 12 12:09:44 test systemd[430]: systemd-sysusers.service: Failed to set up
credentials: Protocol error
Nov 12 12:09:44 test systemd[430]: systemd-sysusers.service: Failed at step
CREDENTIALS spawning
-
- Debug logs:
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Job 350
systemd-sysusers.service/restart finished, result=done
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Converting job
systemd-sysusers.service/restart -> systemd-sysusers.service/start
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service:
ConditionNeedsUpdate=/etc succeeded.
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Passing 0 fds to
service
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: About to execute
systemd-sysusers
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Forked
systemd-sysusers as 430
- Nov 12 12:09:44 test systemd[430]: Successfully forked off '(sd-mkdcreds)' as
PID 431.
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal
sender=org.freedesktop.systemd1 destination=n/a
path=/org/freedesktop/systemd1/unit/systemd_2dsysusers_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=7
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal
sender=org.freedesktop.systemd1 destination=n/a
path=/org/freedesktop/systemd1/unit/systemd_2dsysusers_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=8
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal sender=n/a
destination=n/a
path=/org/freedesktop/systemd1/unit/systemd_2dsysusers_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=2893
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal sender=n/a
destination=n/a
path=/org/freedesktop/systemd1/unit/systemd_2dsysusers_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=2894
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Changed failed ->
start
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal
sender=org.freedesktop.systemd1 destination=n/a path=/org/freedesktop/systemd1
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=9
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal sender=n/a
destination=n/a path=/org/freedesktop/systemd1
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=2895
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Starting Create System Users...
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal
sender=org.freedesktop.systemd1 destination=n/a
path=/org/freedesktop/systemd1/unit/systemd_2dsysusers_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=10
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal
sender=org.freedesktop.systemd1 destination=n/a
path=/org/freedesktop/systemd1/unit/systemd_2dsysusers_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=11
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal sender=n/a
destination=n/a
path=/org/freedesktop/systemd1/unit/systemd_2dsysusers_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=2896
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal sender=n/a
destination=n/a
path=/org/freedesktop/systemd1/unit/systemd_2dsysusers_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=2897
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal
sender=org.freedesktop.systemd1 destination=n/a
path=/org/freedesktop/systemd1/job/350
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=12
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal sender=n/a
destination=n/a path=/org/freedesktop/systemd1/job/350
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=2898
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: systemd-journald.service: Got notification
message from PID 59 (FDSTORE=1)
- Nov 12 12:09:44 test systemd[1]: systemd-journald.service: Added fd 42 (n/a)
to fd store.
- Nov 12 12:09:44 test systemd[431]: Mounting /dev (MS_REC|MS_SLAVE "")...
- Nov 12 12:09:44 test systemd[431]: Failed to mount n/a (type n/a) on /dev
(MS_REC|MS_SLAVE ""): Permission denied
- Nov 12 12:09:44 test systemd[430]: (sd-mkdcreds) failed with exit status 1.
- Nov 12 12:09:44 test systemd[430]: systemd-sysusers.service: Failed to set up
credentials: Protocol error
- Nov 12 12:09:44 test systemd[430]: systemd-sysusers.service: Failed at step
CREDENTIALS spawning systemd-sysusers: Protocol error
- Nov 12 12:09:44 test systemd[1]: Received SIGCHLD from PID 430 ((sysusers)).
- Nov 12 12:09:44 test systemd[1]: Child 430 ((sysusers)) died (code=exited,
status=243/CREDENTIALS)
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Child 430 belongs
to systemd-sysusers.service.
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Main process
exited, code=exited, status=243/CREDENTIALS
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Failed with result
'exit-code'.
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Service will not
restart (restart setting)
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Changed start ->
failed
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal
sender=org.freedesktop.systemd1 destination=n/a path=/org/freedesktop/systemd1
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=13
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: Sent message type=signal sender=n/a
destination=n/a path=/org/freedesktop/systemd1
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=2899
reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
- Nov 12 12:09:44 test systemd[1]: systemd-sysusers.service: Job 350
systemd-sysusers.service/start finished, result=failed
- Nov 12 12:09:44 test systemd[1]: Failed to start Create System Users.
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https://bugs.launchpad.net/bugs/1950787
Title:
systemd-sysusers cannot mount /dev in privileged containers (to pass
credentials)
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https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/1950787/+subscriptions
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